Gr inding-m-ill



(No Model.) 2 Sheets-Sheet 1.

J. H. RUSSELL 8a A. W. PHELPS. GRINDING MILL.

1 173.91 Patented May 11, 1886.

(No Model.) a 2 Sheets-Sheet 2.

J. H. RUSSELL & A. W. PHELPS. GRINDING MILL.

No. 341,818. Patented May 11, 1886.

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SPECIFICATION "forming part of Letters PatentNo. 341,818, dated May 11, 1886.

Application filed January 6, 1886.

To all whom it may concern:

Be it known that we, JOHN H. RUSSELL and ASA IV. PIIELPs, of Springfield, in the county of lValworth and State of \Visconsin, haveinvented certain new and useful Improvements in Grindinglllills, of which the following is a specification.

Our invention relates to that class of grinding-mills commonlyknown as cylinder and concave, and has forits object the improvement of the mechanism by which the concave is supported and adjusted.

In the drawings, Figure 1 is a side elevation of our improved machine; Fig. 2, a top plan view; Fig. 3, a vertical central section at right angles to the axis of rotation; Fig. 4, a front end view; Fig. 5, a horizontal section of a portion of the grinding cylinder and concave, and Fig. 6 a detail view.

Our mill is designed to allow foreign matters-such as frequently find their way with the grain into the inachine to pass between the grindingsurfaces without injury to the latter; and to this end it consists in a novel construction and arrangement of the springsupporting devices for the concave, as hereinafter described in detail, whereby the concave is permitted to yield both vertically and horizontally.

A indicates a substantial framing, consisting of uprights a, longitudinal timbers I), and cross-timbers c, the timbers b carrying boxes or bearings cl, in which the axis or shaft 0 of roll or cylinder B rotates.

Mounted upon the shaft 0, and secured thereto by the heads or disks is a metallic cylinder, y, whose exterior is turned perfectly smooth, and upon said cylinder g are secured, by means of screws h, the plates f, as shown in Figs. 3 and 5. The interior cylinder, g, forms a support for the grindingplatcs f of the cylinder throughout their length. It will thus be seen that the plates of the cylinder can at any time be removed and new ones substituted, as in other machines of this class.

The cylinder B is provided with a bandwheel or pulley, i, by which motion is imparted to the cylinder from any convenient source.

3 indicates the concave, composed of segmental plates j, corresponding to those of the cylinder, end plates, k, and tie-bolts Z, as shown Serial No. 187,822. (No model.)

in Figs. 1, 3, and at, the concave be'ing'supported upon or by arms I) D, pivoted at the rear of the machine in boxes E E. The boxes E E, as shown in Figs. 1 and 3, slide upon the timbers b, and are guided and held in place by metal straps or guards at, secured to the timbers a and b. The boxes E E are also grooved on. their under faces to receive websor flanges p, in order to prevent lateral displacement.

A spring, F, bears at each end against the rear sides of the'boXes E, and its tension is regulated and controlled by means of a setscrew, 92, as shown in Figs. 1, 2, and The ends of the arms D D are bent laterally, as shown in Fig. 2, to form pintles or journals 0, upon and from which, as a center, the arms D and concave 0, carried thereby, rock. A screw, 1}", passes through each strap m, and bears against the forward side of box E when the latter is in its normal position, and thereby regulates the distance between the cylinder and the concave in a horizontal line. A bar, I-I, connects the front ends of the arms D D, as shown in Figs. 2, 3, and 4, said bar H being provided on its under side with a flat spring, I, having its ends slotted, as shown in Fig. 6, and guided by screws. The bar H is provided on its upper face with two screws, I, which, when the millis normally adjusted, are in contact with the under side of the cross-timber c, or a bracket, q, secured thereto.

K indicates a screw stem or rod passing freely through the bracket q and bar H, and headed or enlarged at the under side of spring I, as shown in Figs. 3 and The rod K is pro vided with a hand-wheel, L, having a threaded hub to screw on the rod K, and resting upon the upper side of the bracket q, so that as said wheel is turned it raises or lowers the rod and varies the compression of the spring I.

A semicircular casing, M, corresponding in form to the concave O, is providedto cover the upper surface of the cylinder B, as shown in Figs. 1, 3, and 4, the sheathing of the easing being turned upward at its upper rear edge to form one wall, 1', of ahoppe'r, N. The other end of the sheathing is extended laterally and downward, so as to form a guard, s,

and prevent the ground material from being thrown out too far. The sheathingon the front side of the concave is provided or formed with an upward extension, 1, which, with the wall 1" ofthe sheathing of the cylinder-casing, forms the hopper N, as shown in Figs. 1, 2, and 3.

0 indicates the main hopper, supported on the frame A and delivering the material into the secondary hopper N. It will be seen that the upper casing, M, may at any time be removed, in order to have access to the cylinder and concave. Should any foreign matters be fed into the hopper N and between the cylinder and concave, they would strike against the front side of the latter and tend to deface the grinding-surfaces or spread the cylinder and concave apart. This would rock the concave O 011 its pivots o, depress the forward ends of bars D D, and allow the concave to move far enough away from the cylinder vertically to permit the obstruction to pass the throat or openin This movement of the arms D D compresses the spring'I, which latter returns the arms D D and the concave 0 back to their former positions as soon as it is relieved from undue pressure. As the obstacle works its way backward toward the discharge-outlet, the concave O, with its arms D D and boxes E E, is movedlongitudinally or horizontally against the pressure of spring F sufficiently to allow the obstacle to be discharged. As soon as this is accomplished,the spring F returns the concave to its normal position.

WVhen the machine is running empty, the springs F and I tend to bring the cylinder B and concaveO in contact, and to prevent this the screws G and J are provided to limit the movement of the boxes E E and bar H, respectively.

Having thus described our invention, what we claim is- 1. In a grindingmilhthe co1nbination,with a frame, of a cylinder, B, a concave, G, sliding boxes E E, and arms D I), supporting said concave and pivoted at their rear ends in said sliding boxes E E.

2. In agrinding-mill, the combination,with a frame, of a cylinder, 13, a concave, 0, arms D D, supporting said concave, sliding boxes E E, in which the arms D D are pivoted, and

spring, F, bearing against said boxes, as and for the purpose set forth.

3. In a grinding-mill, the con1bination,with a frame, of a cylinder, B, aconcave, 0, arms D D, supporting said concave and adapted to move vertically and horizontally, springs F .1, arranged, substantially as shown, to return said arms and concave to their normal positions,and set-screws G J, to limit the movements of the concave.

4. In a grinding-mill, the combination,with

.a frame,.of a cylinder, B, concave 0, arms D D, supporting said concave and pivoted at one end, a cross-bar, H, connecting said arms at their other ends, a stem or rod mounted upon the frame and supporting the concave, a spring between the cross-bar and stem or rod, and a set-screw on the crossbar to limit the movement of the latter.

5. The herein-described grinding-mill, consisting of frame A, cylinder B, concave C,arms D D, supporting the concave and pivoted at their rear ends in sliding boxes E E, aspring, F, to urge said boxes forward, set-screws G and iz,for limiting the movement of the boxes EE and compression of spring F, respectively,

cross-bar I-I, connecting the forward ends of 7 bars D D, set-screw J, for limiting the upward movement of said cross-bar, aspring, I, on the under side of bar H, a rod or stem, K, carried by the frame and passing loosely through the bar H and secured to the spring I, and a hand-wheel, Ii, applied to the rod K to raise and lower the same.

JOHN H. RUSSELL. ASA W. PHELPS.

Witnesses:

E. D. RICHARDSON, O. E. BUELL. 

